농업용 저수지의 홍수기 운영을 위한상당강우-저류용량-관리수위 곡선 적용성 분석

Abstract

Agricultural reservoirs in Korea have traditionally been managed primarily for irrigation purposes. However, the increasing frequency and intensity ofextreme rainfall events driven by climate change have heightened concerns about the potential role of reservoirs in aggravating downstream flooding. In response, the Ministry of Agriculture, Food and Rural Affairs introduced the concept of flood-season managed water levels to promote integratedstrategies for both flood control and irrigation supply. This study proposes a practical framework for determining operational rules and optimalmanagement water levels for reservoirs under the jurisdiction of the Korea Rural Community Corporation (KRC) during the flood season. The conceptof equivalent rainfall—defined as the maximum rainfall volume that can be fully stored in a reservoir—is applied to evaluate the adequacy of currentmanagement criteria. Representative reservoirs were grouped into upper, middle, and lower categories based on their storage-to-drainage area ratios. Foreach group, corresponding rainfall–storage volume–management water level (R–S–M) curves were developed. These curves were then used to analyzethe effectiveness of different pre-release strategies and their implications for post-flood irrigation reliability. Based on the findings, reservoir-specificmanagement water levels are recommended to enhance the flood-season operational efficiency while ensuring adequate irrigation supply.